Chocolate Labrador Retriever checks

Labrador Retriever coat colour genetics

September 26, 2014 – 04:04 pm

Kelaeno - Chocolate Labrador
The three recognised colours of Labrador Retriever (top to bottom): Chocolate, black and yellow.

The genetic basis of coat colour in the Labrador Retriever (a highly popular breed of dog) has been studied in detail, and found to depend on several distinct genes. The interplay between these genes is broadly used as an example of epistasis.


Labrador Retrievers are a popular breed of dog in many countries. There are three recognised colours, black, chocolate, and yellow, that result from the interplay among genes that direct production and expression of two pigments, eumelanin and pheomelanin, in the fur and skin of the dog. The recognized colours are due to two genes, while a third gene affects the range of colouration observed within the yellow Labrador. These individual genes do not act independent of each other, and their interaction in affecting the trait of coat color is used to demonstrate the genetic principle of epistasis, where multiple genes affect a single trait.

The genetics of mammalian colouration has been studied in detail, and similar mechanisms have been identified across many species. For this reason, much of the early work on the coloration of dogs in general and Labradors in particular have relied heavily on analogy to the traits characterized in mice and other mammals. Initial genetic studies of coat color in dogs published in the 1950s concluded that there were two main genes involved, one distinguishing blacks from browns, and the other distinguishing blacks from reds and yellows. A 1977 study using crosses within a population of purebred Labradors showed the involvement of two specific genes in production of the three main coat colours of Labradors and described the underlying genetics of these colour varieties.

Labradors showing the two eumelanin colour phenotypes: Black (BB, Bb) and chocolate (bb).


You might also like:

Ace Bigfoot the amazing Chocolate Labrador Retriever
Ace Bigfoot the amazing Chocolate Labrador Retriever

Looking for reputable Chocolate Lab breeder!

Very picky suburban family is seeking an AKC Labrador Retriever Kennel willing to part with a show-quality Chocolate puppy from champion lines (immediate sire and dam must also carry CH title).
We are an extremely loving family that values health, conformation and temperament. Household consists of working parents with lots of flexibility to work from home, two teenage children and two very spoiled, but extremely healthy Golden Retrievers (ages 9 and 11). We have a large fenced yard and plan to spend the first 6 weeks with our puppy at home. We strongly believe in crate training

Dogs Labrador Retriever - Chocolate Labrador Retriever - T-Shirts - Adult Birch-Gray-T-Shirt Large
Apparel ()
  • Adult and youth sizes are a blend of 50% cotton, 50% polyester.
  • Toddler sizes are 100% cotton.
  • Available in white, grey, light blue or pale pink.
  • Custom printed image applied.
  • Washing instructions: Do not use bleach, dry on low heat, turn inside out

Related posts:

  1. Chocolate Labrador Retriever aggressive
  2. Chocolate Labrador Retriever training
  3. Chocolate Labrador Retriever 5 months
  4. Chocolate Labrador Retrievers Hats
  5. Black Labrador Retriever checks